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FF10 different startup behaviour

Each time I click on Firefox icon in Windows 7 startmenu/taskbar Firefox launches an ne w instance instead of activating/switching to an existing runing instance of Firefox.

I believe the above wasn#T true with FF9.
My FF tab options "open new tab instead of new window" is checked.

Each time I click on Firefox icon in Windows 7 startmenu/taskbar Firefox launches an ne w instance instead of activating/switching to an existing runing instance of Firefox.
I believe the above wasn#T true with FF9.
My FF tab options "open new tab instead of new window" is checked.